Substituting for x and y. The vertex formula is as follows where df is the vertex point and xy is the other point. A quadratic equation is an equation that could be written as ax 2 bx c 0 when a 0.
Y ax 2 bx x.
The vertex formula is as follows where df is the vertex point and xy is the other point. This gives the black curve shown. Create the equations by substituting the ordered pair for each point into the general form of the quadratic equation ax2 bx c. If the graph intersects x-axis in two points then the quadratic equation has two roots.